CONVERTIBLE NOTES (Tables)

12 Months Ended

Dec. 31, 2018

Debt Disclosure [Abstract]

Schedule of Net Carrying Amount

The net carrying amount of the Notes were as follows (in thousands):

	Principal outstanding		Unamortized debt discount			Unamortized debt issuance costs			Net carrying value
December 31, 2018
Convertible Notes		442,750		(96,371	)		(8,602	)		337,777

The net carrying amount of the equity component of the Notes were as follows (in thousands):

	Amount allocated to conversion option		Less: allocated issuance costs and Capped call			Equity component, net
December 31, 2018
Convertible notes		105,375		(48,337	)		57,038

The Company recognized interest expense on the Notes as follows (in thousands, except for percentages):

	Year Ended December 31,
	2018
Amortization of debt discount and issuance costs		10,004